Machinery refers to specific machines or machines in general. A farmer has lots of farm machinery, like tractors and plows. Machinery is also the inner workings of something — the machinery of a society is how a society works.
You can refer to a group of machines as machinery, such as the machinery in a factory or the machinery in a laboratory. It’s also the inner workings of a particular machine, like the machinery that keeps your computer running. Machinery has to do with how something works or functions. The government, media, business, and family are all part of the machinery of society. The word machinery originally referred to the devices used for creating stage effects in the theater.